I agree with everyone's opinion. I recommend this to any teenager and up. For me, the earliest 13 will be okay. At our current age, a lot of kids discover new things and they mimic what they saw out of curiosity. The earlier the better.

I could see this book as a required reading for older teenagers. It does deal with some heavy topics, but as teenagers are maturing and getting ready for the outside world, this book would be a great way to bring discussion on in a classroom setting about heavier subject matters.

“Live, and be happy, and make others so.”
― Mary Wollstonecraft Shelley